Aqueous polymer dispersion and its use as a water-vapor barrier

US6710118B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Markus Koppers · Frankenthal (Pfalz), DE
• Marco Schmidt · Stuttgart, DE
• Thomas Anselmann · Landau, DE
• Jurgen Schmidt-Thummes · Schifferstadt, DE
• Mike Zott · Monsheim, DE
• Eckehardt Wistuba · Bad Dürkheim, DE

Key dates

• Filing date: Nov 6, 2002
• Grant date: Mar 23, 2004
• Expiry date: Nov 6, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31935
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

An aqueous polymer dispersion whose polymer, present in disperse distribution, is composed in free-radically polymerized form offrom 20 to 65% by weight of at least one vinylaromatic monomer (monomers A),from 30 to 75% by weight of at least one monomer having two conjugated, ethylenically unsaturated double bonds (monomers B), andfrom 0.5 to 10% by weight of at least one other monomer, C, selected from the group consisting of &agr;,&bgr;-monoethyienically unsaturated mono- and dicarboxylic acids and amide or ester derivatives thereofand whose alkali metal ion content GA, based on the mass of the dispersed polymer, is ≧0.5% by weight, the pH of the aqueous dispersion medium being adjusted to a value below 6.